How to program labview, to take in an analog signal (from DAQ) and display it ?

[Kris Matrix]

Hi,

I am a student at the Univ. Of Minnesota. I am trying to figure out how to build/program in labview such that it can take an analog input and display it on the screen.

I have say an instrument that generates a signal. And suppose i have a DAQ. I use probes to connect the output of the instrument to the DAQ (at the analog input). This should allow my computer to obtain the digital version of the analog signal.

Now if i want Labview to reproduce this analog signal on a graph....how would i got about doing this? Also, if i wanted to convert that same waveform into it's fourier transform equivalent...then how would i do it (all in LABVIEW)

Thanks very much,

K

[Dennis_Knutson]

The best thing for you would probably be the DAQ Assistant. This is on the Measurement I/O>DAQmx palette. Dropping this on your block diagram will start up a wizard that will walk you through the selection of channels, sample rate, etc. There is a Getting Started page with a link to DAQmx basics. When the DAQ Assistant setup is finished, you would just wire a waveform graph to the DAQ Assistant's Data output. Or, right click on the Data Output and select Create>Graph Indicator. Put everything inside a while loop and you're done. There are other Express VIs for signal analysis (i.e. Spectral Measurements) and other, lower level functions on the signal Processing palette. I would also recomend you check the resources for learning the basics of LabVIEW here.